Seleccione filas con valor máximo de grupos de filas agrupadas por varias columnas (PSQL)

select distinct on ("date", location_code, product_code, type)
    "date",
    location_code,
    product_code,
    quantity,
    type,
    updated_at
from transactions t
order by t."date", t.location_code, t.product_code, t.type, t.updated_at desc